External magnetic field density of main traction transformer for EMU

Abstract

Purpose

The purpose of this paper is to determine the external magnetic field density of the traction transformer for EMU and to find the model for its computation.

Design/methodology/approach

The magnetic flux density in the surrounding region of the traction transformer was modeled and calculated using FEM. The transformer was modeled in a way that tank, clamps and current sources were taken into account. Most frequent operating modes for the basic 50 Hz current harmonic, and most represented higher harmonic of 1,950 Hz loading current, were analyzed.

Findings

Matching calculated and measured values were obtained on the finished transformer. The developed calculation has proved to be a useful tool for the stray field calculation outside this type of transformer. Calculated values of the flux density are lower then the maximum permitted values defined by the DIN VDE 0848 standard.

Originality/value

This paper presents a study of calculation compared to measurement of magnetic field density outside an oil immersed transformer.

Citation

Sitar, I., Janic, Z. and Cucic, B. (2012), "External magnetic field density of main traction transformer for EMU", COMPEL - The international journal for computation and mathematics in electrical and electronic engineering, Vol. 31 No. 2, pp. 716-725. https://doi.org/10.1108/03321641211200680